Boat&#39;s crane



Jan. 1

11 927 J. PETERSEN BOATS CRANE Filed Jan. 26 192:

Inventor 1 1 W fl Patented Jan. 11, 1927.

UNITED STATES JOHANNES PETERSEN, OF FLENSBURG, GERMANY.

BOATS CRANE.

Application filed January 31, 192d. Serial No. 689,798.

My invention relates to a boats crane intended as a substitute fordavits and consisting of a slewing crane composed chiefly of a verticalcolumn, a jib consisting of trellis work, manually operated means forturning the column with the jib, and manually operated means for windingup the rope from which the boat is suspended. Owing to the jibconsisting of trellis work, it can extend horizontally exceptionally farso that the boat is perfectly prevented from colliding with the hull ofthe ship even if this latter assumes a very oblique position, and, ifdesired, the jibs at the two sides of the ship may be elongated so muchthat it becomes possible to convey the boats from one side of the shipto the other side by means of the cranes concerned, as is all fullydescribed hereinafter.

My invention is illustrated by way of example in the accompanyingdrawing in which Figure 1 is a side-view of a boats crane constructedand arranged according to my invention, and Figure 2 is an end view of aship provided with cranes of the novel kind, and being drawn to agreatly reduced scale.

The crane consists of a vertical column a supported by a foot-bearing aand maintained in vertical position by a frame (L The jib 6 consists ofit extends a steel-rope 0 supported by rolls 7) p and carrying in itsturn a roll 30 the rolls p p and the appertaining piece of the rope 0forming a kind of tackle. The roll 0 holds the known suspension hook ffor the boat 7".

Opposite to the jib b is a downwardly extending frame If, at the end ofwhich is a platform I) for the operator of the crane. The frame 6 isrigidly connected with the jib and turns with it and the column a. Nearthis latter the-frame 6 forms another platform 6 for another operator,viz, one who is to turn the column with the jib etc, whereas theoperator on the platform 6 is to actuate a winch 0 attached to the frame6 The rope 0 is attached to this winch and actuated by it. (Z is thecrank of the winch.

Another crank Z, is attached to a framenember If and connected with abevel- ,vheel 11 which forms a member of .a bevelwheel gearing 11, 7c,the member 7a of which is affixed to a vertical shaft on carrying at itslower end a cog-wheel h gearing with a larger-cog-wheel g secured to theframe a trellis-work, and over It is obvious that the column a may beturned by means of said gearing Z i 7:: m h g, together, of course, withthe jib and the boat, and it is further obvious that the boat may be letdown or raised, as the case may be, by means of the winch and the rope.

The two jibs illustrated in Figure 2 are each provided with an extensionpiece 'n, from which is suspended a hook a and the figure shows alsothat the boats to be conveyed by the cranes may be arranged one abovethe other. There are in Figure 2 two boats thus arranged at the left andtwo at the right of the stack, and the cranes are shown in full lines,as well as in dotted ones. The latterposition is that in which thecranes lift the boats from the deck; it is a matter of course that thearrangement of the boats relatively to the cranes, in the longitudinaldirection of the vessel, is such that suspension hooks (Fig. 1) can becou pled with the boats.

The object of the extension n (Fig. 2) is to render possible on extremebroad ships conveying a boat from one side of the ship to the other sidethereof, as indicated by dotted lines in Figure 2. The boat to be thusconveyed is attached to the appertaining jib after this latter has beensuitably turned, then the jib is turned still more so as to extendcompletely in the direction to the other side, and the jib of theopposite side is so turned as to be apt to receive the boat from thefirst-mentioned jib, as shown by the dotted lines in Figure 2.

I claim:

1. A boats crane apt for use as a substitute for davits and comprising avertical column adapted to be turned, means for turning it, a jibconsisting of trellis work, a frame connected with the column andextending in downward direction counter to the jib, two platformscarried by said frame, a gearing so arranged as to be in the range of anoperator standing on one of said platforms and'forming part of the meansfor turning said column, a winch so arranged as to be in the range of anoperator standing on the other platform, and a rope, guiderolls for it,and a tackle at the end of the jib, said rope being connected with saidwinch, as set forth.

2. A boats crane apt for use as a substitute for davits and comprising avertical column adapted to be turned, means for turning it, a jibconsisting of trellis work,

an extension at the free end of the jib, a hook suspended from saidextension, a frame connected with the column and extending in downwarddirectioncounter to the jib, two platforms carried by said frame, agearing so arranged as to be in the range of an operator standing on oneof said platforms and forming part of the means for turning otherplatform, and a rope, guide-rolls for it, and a tackle at the end of thejib, said rope being connected with said Winch, as set forth.

J OHANNES PETERSEN.

